warichū; interlinear notes; split annotation
A printing and typesetting term for notes inserted between lines of main text, often set in smaller type. Also refers to the technique of splitting a line into two half-sized columns for parenthetical comments. The loanword 'warichū' is used in English typography discussions.
Reading the interlinear notes in old documents is difficult.
In this edition, the annotations are typeset as warichū between the lines of the main text.
Standard spelling with okurigana.
Variant without okurigana; also seen in technical contexts.
Compound of 割り (wari, 'splitting') + 注 (chū, 'annotation'). The term describes the typographic practice of splitting a line to insert notes.